package com.loooooo.pm2024.utils;

import java.io.*;
import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipUtils {

    public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure, int level) throws RuntimeException {

        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            zos.setLevel(level);
            zos.setMethod(ZipOutputStream.DEFLATED);
            File sourceFile = new File(srcDir);
            compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("1 压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    public static void toZip2(String srcDir, OutputStream out, boolean KeepDirStructure, int level) throws RuntimeException {

        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            zos.setLevel(level);
            zos.setMethod(ZipOutputStream.DEFLATED);
            File sourceFile = new File(srcDir);
            compress2(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("2 压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    public static void toZip3(String srcDir, OutputStream out, boolean KeepDirStructure, int level) throws RuntimeException {

        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            zos.setMethod(ZipOutputStream.STORED);
            File sourceFile = new File(srcDir);
            compress3(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("2 压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    private static final Integer BUFFER_SIZE = 4096;

    public static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception {

        System.out.println(sourceFile.getAbsolutePath());
        System.out.println(name);
        byte[] buf = new byte[BUFFER_SIZE];

        if (sourceFile.isFile()) {
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            zos.putNextEntry(new ZipEntry(name));
            BufferedOutputStream out = new BufferedOutputStream(zos);
            // copy文件到zip输出流中
            int len;
            InputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            // Complete the entry
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }

            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress(file, zos, name + "/" + file.getName(), KeepDirStructure);
                    } else {
                        compress(file, zos, file.getName(), KeepDirStructure);
                    }
                }
            }

        }

    }

    public static void compress2(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception {

        byte[] buf = new byte[BUFFER_SIZE];

        if (sourceFile.isFile()) {
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            zos.putNextEntry(new ZipEntry(name));
            // copy文件到zip输出流中
            int len;
            InputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            // Complete the entry
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }

            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress2(file, zos, name + "/" + file.getName(), KeepDirStructure);
                    } else {
                        compress2(file, zos, file.getName(), KeepDirStructure);
                    }
                }
            }

        }

    }

    public static void compress3(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception {

        byte[] buf = new byte[BUFFER_SIZE];

        if (sourceFile.isFile()) {
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            ZipEntry zipEntry = new ZipEntry(name);
            zipEntry.setSize(sourceFile.length());
            zipEntry.setCompressedSize(sourceFile.length());
            zipEntry.setCrc(crc(sourceFile));
            zos.putNextEntry(zipEntry);

            //BufferedOutputStream out = new BufferedOutputStream(zos);
            // copy文件到zip输出流中
            int len;
            InputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            // Complete the entry
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }

            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress3(file, zos, name + "/" + file.getName(), KeepDirStructure);
                    } else {
                        compress3(file, zos, file.getName(), KeepDirStructure);
                    }
                }
            }

        }

    }

    private static long crc(File file) throws IOException {
        CRC32 crc32 = new CRC32();
        FileInputStream fileinputstream = new FileInputStream(file);
        CheckedInputStream checkedinputstream = new CheckedInputStream(fileinputstream, crc32);
        while (checkedinputstream.read() != -1) {
        }
        checkedinputstream.close();
        return crc32.getValue();
    }

    public static void main(String[] args) throws FileNotFoundException {
        String src = "E:\\275006805254475776";
        File dest = new File("F:\\temp\\275006805254475776.-1.zip");
        File dest2 = new File("F:\\temp\\275006805254475776.1.zip");
        File dest3 = new File("F:\\temp\\275006805254475776.-1.b.zip");
        File dest4 = new File("F:\\temp\\275006805254475776.1.b.zip");
        //toZip3(src, new FileOutputStream(dest3), true, -1);
        toZip(src, new FileOutputStream(dest), true, -1);
        toZip(src, new FileOutputStream(dest2), true, 1);
        toZip(src, new FileOutputStream(dest3), true, -1);
        toZip(src, new FileOutputStream(dest4), true, 1);
        //toZip2(src, new FileOutputStream(dest2), true, -1);
        //toZip2(src, new FileOutputStream(dest4), true, -1);

//        dest = new File("J:\\image\\cardshow\\makeup\\298238456272916480\\298238456272916480.9.zip");
//        toZip(src, new FileOutputStream(dest), true, Deflater.BEST_COMPRESSION);
//
//        dest = new File("J:\\image\\cardshow\\makeup\\298238456272916480\\298238456272916480.1.zip");
//        toZip(src, new FileOutputStream(dest), true, 1);
    }

    public static void createZip(List<File> fileList, OutputStream out) throws RuntimeException {

        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            zos.setLevel(0);
            zos.setMethod(ZipOutputStream.DEFLATED);
            for (File file : fileList) {
                compress(file, zos, file.getName(), true);
            }
            long end = System.currentTimeMillis();
            System.out.println("1 压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }


}
